The PF20.1 fits 20.1" LCD desktop monitors. It helps keep confidential and private information safe. The filter utilizes 3M's microlouver privacy technology so only persons directly in front of the monitor can see the image on screen, passersby see only a dark screen. Excellent for high traffic areas, helps to protect your LCD panel from scratches and abrasions. The PF20.1 features an easy on easy off attachment system.